PRSV: The stryjek‐vera modification of the peng‐robinson equation of state. Parameters for other pure compounds of industrial interest

Proust, Patricio C.; Vera, Juan H.

doi:10.1002/cjce.5450670125

Cited by 64 publications

(26 citation statements)

References 21 publications

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“…This can be partly related to the larger thermodynamic input data (i.e., Gibbs energy , enthalpy , entropy , heat capacity functions , and volume ) of their thermodynamic databases and to their numerical solver [44,45] in comparison to LMA codes. Both code types have their advantages and disadvantages, and the recent development of the Reaktoro code package [53,54], which combines the strengths of both LMA and GEM methods, has seen many promising improvements for Proust and Vera (1989) [61]. 10 Stryjek and Vera (1986) [62].…”

Section: Numerical Modeling Codes: Lma and Gem Methodsmentioning

confidence: 99%

Rare Earth Elements in Mineral Deposits: Speciation in Hydrothermal Fluids and Partitioning in Calcite

Perry

Gysi

2018

Geofluids

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is properly cited.Studying the speciation and mineral-fluid partitioning of the rare earth elements (REE) allows us to delineate the key processes responsible for the formation of economic REE mineral deposits in natural systems. Hydrothermal REE-bearing calcite is typically hosted in carbonatites and alkaline rocks, such as the giant Bayan Obo REE deposit in China and potential REE deposits such as Bear Lodge, WY. The compositions of these hydrothermal veins yield valuable information regarding pressure ( ), temperature ( ), salinity, and other physicochemical conditions under which the REE can be fractionated and concentrated in crustal fluids. This study presents numerical simulation results of the speciation of REE in aqueous NaCl-H 2 O-CO 2 -bearing hydrothermal fluids and a new partitioning model between calcite and fluids at different --conditions. Results show that, in a high CO 2 and low salinity system, bicarbonate/carbonate are the main transporting ligands for the REE, but predominance shifts to chloride complexes in systems with high CO 2 and high salinity. Hydroxyl REE complexes may be important for the solubility and transport of the REE in alkaline fluids. These numerical predictions allow us to make quantitative interpretations of hydrothermal processes in REE mineral deposits, particularly in carbonatites, and show where future experimental work will be essential in improving our modeling capabilities for these ore-forming processes.

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Section: Numerical Modeling Codes: Lma and Gem Methodsmentioning

confidence: 99%

Rare Earth Elements in Mineral Deposits: Speciation in Hydrothermal Fluids and Partitioning in Calcite

Perry

Gysi

2018

Geofluids

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“…The pure component parameters for water and propane were obtained from Stryjek and Vera (1986a). MDEA was not listed in their table, nor in a later table of Proust and Vera (1989). The parameters for MDEA were obtained in this study as follows.…”

Section: The Prsv Equation Of Statementioning

confidence: 99%

Phase equilibria in the system water‐methyldiethanolamine‐propane

Carroll¹,

Jou²,

Mather³

et al. 1992

AIChE Journal

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“…The physical significance of equation (14) is quite clear: whether a binary system is a positive deviation system or a negative deviation system is entirely defined by the sign of the interaction parameter while the magnitude of the deviation is a result of this parameter in combination with the volumetric effects of the components. To illustrate the characteristics of the values of 12 , we have used the PRSV equation of state [14,15] The excess Gibbs free energy equation for binary systems can be readily extended to multicomponent systems. The resulting excess Gibbs free energy equation and the corresponding equations for the logarithm of the activity coefficient of the k-th component in an N-component system are…”

Section: Extending the Van Laar Model To Multicomponent Systemsmentioning

confidence: 99%

Extending the Van Laar Model to Multicomponent Systems

Peng¹

2010

TOTHERJ

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Abstract:The original van Laar equation for representing the excess Gibbs free energies of liquid mixtures contains certain deficiencies that have prevented the equation from being applied to multicomponent systems. We have analyzed the temperature dependency of the energy parameter in modern cubic equations of state and modified the original van Laar equation with a view to extending the equation to multicomponent systems. It is found that the consideration of the temperature dependency of the energy parameter has lead to a modified van Laar equation involving additional terms. These extra terms serve to provide some physical significance that can be attached to the van Laar equation to allow it to unambiguously represent the behavior of the excess Gibbs free energy and activity coefficients of nonideal solutions. The final form of the modified van Laar equation for multicomponent mixtures involves two size parameters and an interaction parameter for each of the constituent binary pairs; the latter parameter replaces a term consisting of a combination of the two energy parameters and two size parameters for the components in a binary mixture. For mixtures involving only hydrocarbons the size parameters can be readily calculated from the critical properties by means of any of the cubic equations of state of the van der Waals type.

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PRSV: The stryjek‐vera modification of the peng‐robinson equation of state. Parameters for other pure compounds of industrial interest

Cited by 64 publications

References 21 publications

Rare Earth Elements in Mineral Deposits: Speciation in Hydrothermal Fluids and Partitioning in Calcite

Rare Earth Elements in Mineral Deposits: Speciation in Hydrothermal Fluids and Partitioning in Calcite

Phase equilibria in the system water‐methyldiethanolamine‐propane

Extending the Van Laar Model to Multicomponent Systems

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